I will see if I can describe it better.
Your leaf bushing look flat on the end like mine did. They also look like they don't have a metal sleeve in them. Again like mine did.
So when I tightened up the shackles good and tight, I was squeezing the shackle into the bushing and the bushing into the frame or leaf, making it so the leaf couldn't extends or retract. The shackle needs to be able to be able to swing a little bit as the leaf flattens and curves. Mine could not budge.
The Hotchkiss leaf's I replaced them with, had a cone shape bushing with a metal sleeve. They can be tightened up without pinching on the bushing and the shackle will still articulate.
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